They don't have nicknames and here's a breif explanation of Each teams's uniform
Alabama: The State Flag
Georgia: Peaches
Florida: The Everglades
Tennessee: The Smoky Mountains
Atlanta: Seems like Most of their teams go red and some variation of yellow
New Orleans: Mardi Gras
Arkansas: State Flag
Louisiana: State Flags and wings are for Pelicans
Key West: Beaches
Kentucky: The Colors of Churchill Charlie, official mascot of Churchill Downs